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The following table lists optional URLs that your session host virtual machines might also need to access for other services Address Outbound TCP port Purpose login.windows.net
443 Sign into Microsoft Online Services and Microsoft 365
*.events.data.microsoft.com
443 Telemetry Service www.msftconnecttest.com
443 Detects if the session host is connected to the internet
*.prod.do.dsp.mp.microsoft.com 443
Windows Update *.sfx.ms
443 Updates for OneDrive client software
*.digicert.com
443
Certificate revocation check *.azure-dns.com
443
Azure DNS resolution *.azure-dns.net
443 Azure DNS resolution
If the users need to access Microsoft 365, make sure the session hosts can connect to Microsoft 365 endpoints. Office 365 URLs and IP address ranges can be found from Microsoft Official Site
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